I was looking at a 1977 Merc 40 HP Outboard and couldn't see how to remove the engine cover. There is the similar front chrome cover plate on my 85 HP which has a simple twist knob to turn to remove that and then the engine wrap cover release is exposed. This one is different and I didn't have a lot of time to figure out the removal procedure of that cover plate. As well, are there any engine parts diagrams or repair manuals available on line for this type engine? Info much appreciated.